PMM Server issue/bug

Same as this persons problem -

I wanted to change the password, so on grafana I went to profile and did it that way. I then logged out and tried logging in again, to my amazment the password I changed it to wasn’t working. I’m getting the same error message aswell:
{“message”:“Invalid username or password”} Thats what happens why I try logging in with the old username and password, when I try the new one nothing happens and it just asks me to enter it again. I’ve tried changing the password following this guide - but that also hasn’t worked. Any suggestions? Thanks